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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <script>
        const name = "jack";
        const num = 20;
        // ${} 解析 变量 值 表达式
        console.log(`this is str content ${name}`);
        console.log(`this is str content ${"jack"}`);
        console.log(`this is str content ${100}`);
        console.log(`this is str content ${1 + 2}`);
        console.log(`this is str content ${1 + 2 + num}`);
    </script>
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